APA (7 वां संस्करण) प्रशस्ति पत्र

Gordman Robert. (2006). Must-Have Customer: 7 steps to winning the customer you haven't got. Truman Talley Books St.Martin Press.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Gordman Robert. Must-Have Customer: 7 Steps to Winning the Customer You Haven't Got. NewYork: Truman Talley Books St.Martin Press, 2006.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Gordman Robert. Must-Have Customer: 7 Steps to Winning the Customer You Haven't Got. Truman Talley Books St.Martin Press, 2006.